i am really perplexed. We have no problem sending and receiving email to anyone except one client from Australia. The sysadmin claiims emails to our network is being bounced back within 30 seconds stating the message did not reach some or all of the intended recipients. "The email system was unable to deliver the message but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator. <cname.domain.com #5.0.0 smtp; 550 5.0.0 Access denied>" I know that this error is a very generic SMTP error just not sure where it is emanating from.